Resistance device for a physical exerciser

ABSTRACT

A resistance device for a physical exerciser includes a tubular rotatable seat having an inner cylindrical surface formed with two spiral grooves, an inner tube dimensioned to be slidably fitted into the rotatable seat and having two opposite longitudinal through slots, a slide dimensioned to be slidably fitted into the inner tube and provided at an end with a lug having a notch, the slide being formed with a radial hole, a rear cover engaged with an end of the inner tube, a front cover engaged with an outer end of the rotatable seat; and a pin extending through the longitudinal through slots of the inner tube to engage with the spiral grooves, whereby the resistance device can be easily assembled, operated and adjusted smoothly.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] This invention is related to a resistance device for a physical exerciser and in particular to one which can be easily assembled, operated and adjusted smoothly.

[0003] 2. Description of the Prior Art

[0004] A great variety of machines have been developed for exercising various portions of the human body. In the majority of such a machines, the user exercises against a resistance created by a cable resistance mechanism. Nevertheless, such a resistance mechanism can be operated and adjusted smoothly thereby causing much inconvenience in use.

[0005] Therefore, it is an object of the present invention to provide an improved resistance device for a physical exerciser which can obviate and mitigate the above-mentioned drawbacks.

SUMMARY OF THE INVENTION

[0006] This invention is related to a resistance device for a physical exerciser.

[0007] It is the primary object of the present invention to provide a resistance device for a physical exerciser which can be easily assembled.

[0008] It is another object of the present invention to provide a resistance device for a physical exerciser which can be easily adjusted.

[0009] It is a further object of the present invention to provide a resistance device for a physical exerciser which can be operated smoothly.

[0010] According to the preferred embodiment of the present invention, a resistance device for a physical exerciser includes a tubular rotatable seat having an inner cylindrical surface formed with two spiral grooves, an inner tube dimensioned to be slidably fitted into the rotatable seat and having two opposite longitudinal through slots, a slide dimensioned to be slidably fitted into the inner tube and provided at an end with a lug having a notch, the slide being formed with a radial hole, a rear cover engaged with an end of the inner tube, a front cover engaged with an outer end of the rotatable seat; and a pin extending through the longitudinal through slots of the inner tube to engage with the spiral grooves.

[0011] The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.

[0012] Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013]FIG. 1 is a perspective view of the present invention;

[0014]FIG. 2 is an exploded view of the present invention;

[0015]FIG. 3 is a sectional view of the present invention;

[0016]FIGS. 4 and 5 illustrate the working principle of the present invention; and

[0017]FIGS. 6 and 6A illustrate how the present invention is connected with a magnetically controlled fywheel.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0018] For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings. Specific language will be used to describe same. It will, nevertheless, be understood that no limitation of the scope of the invention is thereby intended, alterations and further modifications in the illustrated device, and further applications of the principles of the invention as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates.

[0019] With reference to the drawings and in particular to FIGS. 1, 2 and 3 thereof, the resistance device 100 for a physical exerciser according to the present invention generally comprises a rotatable seat 1, an inner tube 2, a slide 3, a front cover 5, and a rear cover 6.

[0020] The rotatable seat 1 is a tubular member formed at an end with a cavity 11 in which is fitted a spring 12 and a block 13. The inner cylindrical surface of the rotatable seat 1 is formed with two spiral grooves 14.

[0021] The inner tube 2 is dimensioned to be slidably fitted into the rotatable seat 1 and formed at an end with a groove 21 and a flange 22 adjacent to the groove 21. The inner tube 2 has two longitudinal through slot 23 at two opposite sides thereof.

[0022] The slide 3 is dimensioned to be slidably fitted into the inner tube 2 and provided at an end with a lug 31 having a notch 32. Further, the slide 3 is formed with a radial hole 33.

[0023] The rear cover 6 is formed at the inner side with an inwardly extending flange 61 adapted to engage with the groove 21 of the inner tube 2. A spring 34 is arranged between the rear cover 6 and the slide 3. The rear cover 6 is formed with a through hole 60 at the center thereof.

[0024] The front cover 5 is formed with a plurality of equidistant recesses 51 at the inner side and fixedly mounted on the rotatable seat 1 by a screw (shown but not numbered). The recess 51 is designed to receive the block 3 thereby enabling the rotatable seat 3 to be kept in place.

[0025] A nipple 7 connected with an end of a cable 71 is fitted into the notch 32 of the slide 3. The other end of the cable 71 extends through the hole 60 of the rear cover 6 to connect with a magnetically controlled flywheel 9 (see FIG. 6A).

[0026] When the rotatable seat 1 is turned clockwise (see FIG. 4), the slide 3 will be guided along the spiral grooves 14 to go further into the rotatable seat 3 thereby pulling the cable 71 to move into the rotatable seat 3. As the rotatable seat 1 is turned counterclockwise (see FIG. 5), the slide 3 will be guided along the spiral grooves 14 to go further out of the rotatable seat 3 thereby releasing the cable 71.

[0027]FIGS. 6 and 6A illustrate an application of the present invention. As shown, the cable 71 is connected between the resistance device 100 and a magnetically controlled flywheel 9. The magnetically controlled flywheel 9 comprises a circular iron member 91, a plurality of magnets 92, a sliding block 95, a plurality of springs 94, and a circular band 93. The magnets 92 are mounted on the circular band 93 which is urged by the springs 94 so as to push the magnets 92 against the circular iron member 91. The other end of the cable 71 is connected with the sliding block 95. As the rotatable seat 1 is turned clockwise, the cable 7 will pull the sliding block 95 to go inwardly thereby decreasing the distance between the magnets 92 and the circular iron member 91 and therefore providing a larger resistance to the magnetically controlled flywheel. When the rotatable seat 1 is turned clockwise, the cable 7 will release the sliding block 95 thereby increasing the distance between the magnets 92 and the circular iron member 91.

[0028] It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.

[0029] While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. 

I claim:
 1. A resistance device for a physical exerciser comprising: a tubular rotatable seat having an inner cylindrical surface formed with two spiral grooves; an inner tube dimensioned to be slidably fitted into said rotatable seat and having two opposite longitudinal through slots; a slide dimensioned to be slidably fitted into said inner tube and provided at an end with a lug having a notch, said slide being formed with a radial hole; a rear cover engaged with an end of said inner tube; a front cover engaged with an outer end of said rotatable seat; and a pin extending through said longitudinal through slots of said inner tube to engage with said spiral grooves.
 2. The resistance device for a physical exerciser as claimed in claim 1, wherein an end of said rotatable seat is formed with a cavity in which is fitted a spring and a block, and an inner side of said front cover is formed with a plurality of equidistant recesses adapted to engage with said block so as to keep said rotatable seat in place.
 3. The resistance device for a physical exerciser as claimed in claim 1, wherein an end of said inner tube is formed with a groove and a flange adjacent to said groove for engaging with said rear cover.
 4. The resistance device for a physical exerciser as claimed in claim 1, wherein a spring is arranged between said slide and said rear cover. 